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Ratio and Proportion | Maths



  • Ratio of a to b  is a : b = a/b 
  • The equality of two ratios is called proportion 
  • If a:b = c:d that is a : b : : c : d , then a/b = c/d




Questions
1.If x:y=3:4. Then 4x+5y:5x-2y=------ (Fireman Driver NCA 2020)
4x=3y
Therefore 4x+5y : 5x-2y=
8Y : 15y/4 - 2y
8y : 7y/4
(8*4) / 7
32/7

 2018
1.The ratio of the length of a ground to its width is 5 : 2. Find its length if the width is 50 meters (Sergeant 2018)
5/2=L/50
L=125m

2.ചതുരാകൃതിയിലുള്ള പുരയിടത്തിന്റെ നീളവും ചുറ്റളവും തമ്മിലുള്ള അംശബന്ധം 1 : 3 ആണ്. എങ്കിൽ ആ പുരയിടത്തിന്റെ നീളവും വീതിയും തമ്മിലുള്ള അംശബന്ധമെന്ത്?
(Attender Gr.II 2018)
l/2(l+b)=⅓ 3l=2l+2b l=2b l/b=2:1




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